Armalite was the last company, that I know of, that made A1 furniture, and they stopped 2plus years ago. There are several companies selling surplus "M-16" grips, a couple on the EE, but they are "fiberglass" and not plastic.

" no tack (driver), no bull (barrel)" -damn "Feinstein state"
the red X in the box is my avatar !!

Northridge has used M16A1 sets for $20. They include the stock, triangular handguards and grip. They are in good shape and great for those camo jobs if your into that. I did a set in OD Aluma Hyde II. Came out about Armalite green and has held up well, and looks like it was made that way instead of being painted. If you use the A1 stock, you need to get the A1 stock screw or you will go nuts. [:)]
http://northridgeinc.com/ar15_m16.htm
about half way down the page